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Wave Solder Timer

Publishing Venue

IBM

Related People

Nalasco, M: AUTHOR

Abstract

When a semiconductor module is to be joined to a printed circuit card, the module pins are inserted through holes in the printed circuit card, and the assembly is slowly passed over a bath of molten tin-lead solder. The pins of the module, which project through the card to the back side of the card, come into contact with the molten solder, and as the card passes across the back, the soldering operation takes place. Since the contour of the surface of the solder bath is convex, the duration of exposure of the module pins to the solder is critical.

Country

United States

Language

English (United States)

This text was extracted from a PDF file.

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This is the abbreviated version, containing approximately
74% of the total text.

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Wave Solder Timer

When a semiconductor module is to be joined to a printed circuit card, the
module pins are inserted through holes in the printed circuit card, and the
assembly is slowly passed over a bath of molten tin-lead solder. The pins of the
module, which project through the card to the back side of the card, come into
contact with the molten solder, and as the card passes across the back, the
soldering operation takes place. Since the contour of the surface of the solder
bath is convex, the duration of exposure of the module pins to the solder is
critical.

The feature described herein is a testing technique for timing the duration of
the exposure of the module pins to the surface of the molten solder. The figure
shows the principle of the invention. A test module 2 is shown with two of its pins
3 and 5 connected to the timing circuit. The timer 6 consists of a turn-on circuit 8
which sends an enabling pulse to the gate 9 when the circuit is completed
between the pins 3 and 5 by the solder 4. The gate 9 then starts the digital
counter 10. When the circuit between pins 3 and 5 is opened by removal from
the solder 4, the turn-off circuit 7 sends a disabling signal to gate 9 which stops
the digital counter 10. The accumulated value on counter 10 is proportional to
the duration of immersion of pins 3 and 5.

The module pins 3 and 5 are inserted through the holes of a printed circuit
card, and the assembly is passed over the solder bath 4 at a selected speed.
W...